Method empty

compiler/cpp/tests/catch/catch.hpp:8608–8610

        line( _line )
    {}
    bool SourceLineInfo::empty() const {
        return file[0] == '\0';
    }
    bool SourceLineInfo::operator == ( SourceLineInfo const& other ) const {
        return line == other.line && (file == other.file || std::strcmp(file, other.file) == 0);
    }